The card must be switched on again before changing power state (ie. rebooting, powering off or sleeping), or the machine will hang.

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=== Switching off ===

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To switch OFF, call the preparation method first (see above), then call <code>_SB.PCI0.P0P4.GFX0._PS3</code>. Switching off lowers the battery discharging rate by around 200mA, giving 10 to 15% more battery life. The card must be switched on again before changing power state (ie. rebooting, powering off or sleeping), or the machine will hang.

=== Switching on ===

=== Switching on ===

To switch ON, call <code>_SB.PCI0.P0P4.GFX0._PS0</code>.

To switch ON, call <code>_SB.PCI0.P0P4.GFX0._PS0</code>.

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=== Querying power state ===

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To query the discrete card power state, call <code>_SB.PCI0.P0P4.GFX0._PSC</code>. It will return one of the following values:

Switching off

To switch OFF, call the preparation method first (see above), then call _SB.PCI0.P0P4.GFX0._PS3. Switching off lowers the battery discharging rate by around 200mA, giving 10 to 15% more battery life. The card must be switched on again before changing power state (ie. rebooting, powering off or sleeping), or the machine will hang.

Switching on

To switch ON, call _SB.PCI0.P0P4.GFX0._PS0.

Querying power state

To query the discrete card power state, call _SB.PCI0.P0P4.GFX0._PSC. It will return one of the following values: